A set of four moulded blocks, linked together by slotted wooden straps for added security. The system is clamped in position with two wing nuts and the height is adjusted by inserting the blocks supplied. Height raise 75, 95 or 114mm (3, 33/4 or 41/2'). Maximum width of leg 70mm (23/4') diameter. Overall width adjustment 432 x 330mm (17 x 13'). Weight 2.5kg.